问题描述：
-Will you be free at 9 o'clock tomorrow morning? -I'm afraid not.I___a class reunion then.
A.was attending
B.am attending
C.will have attended
D.will be attending
答案是D 告诉我为什么B不对
A.was attending
B.am attending
C.will have attended
D.will be attending
答案是D 告诉我为什么B不对
问题解答：
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